Power status telemetry for powered devices in a system with power over ethernet
AssigneeMaxim Integrated Products, Inc.
InventorsGaoling Zou, Alberto Viviani, Yangyang Wen, Qicheng Huang
Life of this patent
Estimating the term…
Abstract
A powered device interface assembly includes an optocoupler and a powered device interface. The opto-coupler is electrically coupled with a microcontroller of the power device interface. The powered device interface includes a telemetry circuit coupled with the opto-coupler and configured to generate encoded telemetry information for output via a single pin of the powered device interface for transmission to the microcontroller of the powered device, wherein the opto-coupler is coupled with the single pin and is configured to electrically isolate the single pin from the microcontroller.
Claims18
A powered device in a system employing power over ethernet, the powered device comprising:
- a powered device interface including a telemetry circuit configured to generate encoded telemetry information for output via the powered device interface;
- a microcontroller coupled with the powered device interface;
- and
- one or more opto-couplers coupled with the powered device interface, the one or more opto-couplers configured to electrically isolate the powered device interface from the microcontroller,
- wherein the microcontroller is configured to generate at least one of power limit information or current limit information for transmission to the powered device interface via the one or more opto-couplers,
- wherein the encoded telemetry information includes a start pulse width, a first data pulse width, and a second data pulse width, wherein each of the start pulse width, the first data pulse width, and the second data pulse width differs from each other of the start pulse width, the first data pulse width, and the second data pulse width.
A method for providing telemetry information from a powered device interface of a powered device, the method comprising:
- generating encoded telemetry information of the powered device via the powered device interface;
- transmitting the encoded telemetry information to a microcontroller of the powered device;
- electrically isolating the powered device interface from the microcontroller via one or more opto-couplers;
- generating one or more of power limit information or current limit information via the microcontroller;
- and
- transmitting the one or more of power limit information or current limit information from the microcontroller to the powered device interface via the one or more opto-couplers,
- wherein the encoded telemetry information includes a start pulse width, a first data pulse width, and a second data pulse width, wherein each of the start pulse width, the first data pulse width, and the second data pulse width differs from each other of the start pulse width, the first data pulse width, and the second data pulse width.
Dependencies are inferred from the claim text.